BULETIN FISIKA
Vol 24 No 1 (2023): BULETIN FISIKA February Edition

Earthquake Hypocenter Relocation in The Abang-Culik Fault, Karangasem using Coupled Velocity-Hypocenter Method

Made Prama Yudistira (Universitas Udayana)
I Ketut Sukarasa (Udayana University)
I Made Kris Adi Astra (Pusat Gempabumi Regional III-BMKG, Jl. Raya Tuban, Kuta, Badung, Bali, Indonesia, 80361)



Article Info

Publish Date
17 Oct 2021

Abstract

Research has been done about the relocation of earthquake hypocenter position, seismic wave local velocity and correction of seismic wave recording station at the Abang-Culik Fault area according to coordinate 115,25°-115,75° BT and 8,00°-8,60° LS. Data which was used on this research was the earthquake data that occur in the 2015-2020 period. The research was conducted using the coupled velocity-hypocenter method. From the relocation result, the position of the earthquake hypocenter shifted, which initially spread to become more concentrated in the fault plane area. The local velocity decreasing a lot in the 3rd layer which was influenced by the presence of the Mount Agung magma pocket in that area. The correction of Station shown that only 1 station has a negative value of delay time, namely IGBI station while the other 13 stations show a positive value of delay time. Abstrak Telah dilakukan penelitian tentang relokasi posisi hiposenter gempabumi, model kecepatan lokal gelombang seismik dan koreksi stasiun pencatat gelombang seismik di daerah Sesar Abang-Culik dan sekitarnya koordinat 115,25°-115,75° BT dan 8,00°-8,60° LS. Data yang digunakan merupakan data kejadian gempabumi pada periode 2015-2020. Penelitian dilakukan dengan menggunakan metode coupled velocity-hypocenter. Dari hasil relokasi diperoleh, posisi hiposenter gempabumi mengalami pergeseran, yang awalnya menyebar menjadi lebih terpusat di daerah bidang sesarnya. Kecepatan lokal mengalami penurunan yang signifikan pada lapisan ke-3 yang dipengaruhi oleh adanya kantung magma Gunung Agung di daerah penelitian. Hasil koreksi stasiun menunjukkan hanya 1 stasiun yang memiliki nilai delay time bertanda negatif yaitu stasiun IGBI sedangkan 13 stasiun lainnya menunjukkan nilai delay time bertanda positif.

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Journal Info

Abbrev

buletinfisika

Publisher

Subject

Earth & Planetary Sciences Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics

Description

The Journal aims to promote the theory and application in the field of physics, and to encourage a vigorous dialogue between scholars and researchers all over the world. It presents original research articles, letters as well as review articles, publishes the latest achievements and developments in ...